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OpenStudy (anonymous):
What is the sum of an 8–term geometric series if the first term is –11, the last term is 180,224, and the common ratio is –4?
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OpenStudy (cwrw238):
S8 = -11 * ( 1 - (-4)^8) --------- 1 - (-4)
OpenStudy (cwrw238):
can u calculate that?
OpenStudy (anonymous):
144177
OpenStudy (cwrw238):
= 720885 / 5 = 144177
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